---
title: "Agent Development - Air Market"
description: "You are building a plugin for Claude Code and want it to include its own agent, a helper that steps in on its own when the right kind of work appears. This skill walks you through creating one, from…"
canonical: "https://airmarket.ai/app/agent-development"
---

[Air Market](/) / [Developer Tools](/category/devtools) / Agent Development

Skill by [Anthropic](/@anthropics)

# Agent Development

Create, structure and refine agents for Claude Code plugins

## What this does

You are building a plugin for Claude Code and want it to include its own agent, a helper that steps in on its own when the right kind of work appears. This skill walks you through creating one, from the settings at the top of its file to the instructions inside it. Reach for it whenever you are adding an agent and are unsure what goes where, or when exactly it should take over.

### Top 3 things it does for you

- Create a new agent or subagent for my plugin
- Structure my agent's frontmatter, system prompt and tools
- Decide when my agent should be triggered

## Information

**Agent Development at a glance**

|  |  |
| --- | --- |
| Kind | Skill |
| Publisher | [Anthropic](/@anthropics) |
| Category | [Developer Tools](/category/devtools) |
| Works with | Agent Skills - an open standard supported by 40+ agents |
| Languages | en |
| Version | 0.1.0 |
| Size | 69 KB |
| Licence | _Not recorded_ |
| Repository | [anthropics/claude-code](https://github.com/anthropics/claude-code/tree/cc898dc3692fb583f36ab327942aad20b7d3dbd0/plugins/plugin-dev/skills/agent-development) |
| GitHub stars | 155,070 (as of Nov 2026) |
| Installs | 19,596, counted by skills.sh (Nov 2026) |

## Security report

**Verified.** AIR scanned this exact version of Agent Development and flagged nothing. AIR's verdict: **safe**.

**What Agent Development's check was run against**

|  |  |
| --- | --- |
| Commit | cc898dc3692fb583f36ab327942aad20b7d3dbd0 |
| Content hash | 9c663ddfe817c57ae336c1328a6ed3ed0ddcf39918064b4baecec18e4f2d5ae6 |
| Files read | [Browse the files at this exact commit](https://github.com/anthropics/claude-code/blob/cc898dc3692fb583f36ab327942aad20b7d3dbd0/plugins/plugin-dev/skills/agent-development/SKILL.md) |

A scan is named by the exact content it read, not by a version number. A different version is a different artifact, and nothing here applies to a version AIR has not scanned.

[Read the full security report for Agent Development](/security/agent-development)

## About Agent Development

This skill is for people building Claude Code plugins who want to add an agent: something that works on its own when a particular kind of request turns up. It covers creating and writing agents and subagents, and how an agent file is put together, from the frontmatter settings at the top to the system prompt beneath.

A large part of getting an agent right is deciding when it should be used. You get guidance on writing descriptions and examples so the agent fires in the situations you intend, and on choosing which tools it may use.

It also touches the finishing details, such as picking a color for your agent, and carries the broader best practices for agent development in Claude Code plugins.

## What's inside

- SKILL.md - instructions
- examples/agent-creation-prompt.md - reference
- examples/complete-agent-examples.md - reference
- references/agent-creation-system-prompt.md - reference
- references/system-prompt-design.md - reference
- references/triggering-examples.md - reference
- scripts/validate-agent.sh - script

## Questions

### Is Agent Development safe to install?

AIR scanned this exact version of Agent Development and flagged nothing. AIR's verdict: safe. The verdict is named by the content that was read, at commit cc898dc3692f, so it cannot drift onto a version nobody scanned. The full report is at https://airmarket.ai/security/agent-development.

### How do I install Agent Development?

Open https://airmarket.ai/app/agent-development on Air Market and use the install action: Air Market hands Claude a prompt naming this exact skill, and Claude sets it up. Source, pinned to the exact commit this listing describes: https://github.com/anthropics/claude-code/tree/cc898dc3692fb583f36ab327942aad20b7d3dbd0/plugins/plugin-dev/skills/agent-development. Install from that link, not the branch.

## Related on Air Market

- [More Developer Tools listings](/category/devtools)
- [Everything by Anthropic](/@anthropics)

---

Canonical URL: <https://airmarket.ai/app/agent-development>